Embossing dies



Jan. 4, 1 27. 1,612,907

C. CHISHOLM EMBOSSING DIES Filed March 9 1925 Patented Jan. 4, 1927. I i v i I UNITED STATES PATENT OFFICE.

CLIFTON OHISHOLM, OF CLEVELAND, OHIO, ASSIGNOB TO THE AMERICAN MULTI- GBAPH COMPANY, OF CLEVELAND, OHIO, A CORPORATION OF OHIO.

IEMBOSSING DIES. Application filed March 9, 1925. Serial No. 1 ,008.

My prior application No. 535,311 filed indicated by the line 3-3 of Fig. 2; Fig. February 9, 1922, shows an embossing ma- 4 is a perspective of one of the die blocks. chine having a reciprocatory, die head in As shown in Figs. 1 and 2, indicates a which are mounted two rows of individually reciprocatory die head comprising a body 5 movable die blocks, provided respectively having a vertical longitudinal slot 11 exwith male and, female dies .on their opposed tending downwardly from its upper surface ends. A plunger mechanism causes the and having depending legs 12 by which it is selected die blocks to approach each other guided along a suitable guide bar 20. The to embossed interposed material. The die legs are shown as carrying rollers 14 engag- 10 blocks in that application have guiding ribs ing upper and under surfaces of the bar 20. along their upper and under edges occupy- The longitudinal slot 11 in the die head ening corresponding grooves in the die head. ables this head to straddle stationary frame Now, I have found that the accurate mabars 25 and 26. The former plate is shown chining of the guiding ribs on the die blocks as having a ledge 2'? at this lower edge which 15 and the corresponding grooves in the die may carry a channel-shaped ribbon of metal 7 head entails considerable expense which may A adapted to bo embossed, this ribbon bebe avoided if the ribs and grooves are ing guided by the face of the other frame omitted and the set of die blocks mounted in bar 26. The die head is shown as having an open frame, each block rubbing against rollers 15 engaging opposite outer faces of 29 its neighbor. Such a construction, by avoidthese frame barsing the clearance between adjacent die blocks Within the die head are open rectangular has the further advantage of somewhat respacesfor the groups of die blocks. The

ducin the length of the die head. I find, spaces are bounded on their under sides by however, that when selected die blocks, havthe fiat top of the body 10 at their ends by ing continuous fiat faces, lie against each the end portions 16 and an intermediate parother, the adhesion is so great as to require tition 17 of the body, and at their tops by undue power to the blocks and furthermore the flat underface of the horizontal bars 18 there is lik lihood that any block will drag of the die head.

the adjacent block or blocks along with it. In the open spaces provided as described,

I have discovered that I can obtain thev there are mounted rows of die blocks 30, advantages of plain rectangular abutting these die blocks being of the general recblocks, without the disadvantages specified, tangular shape shown and mounted side by by recessing the side walls of the blocks. I side in contact with each other. The die also find that by making holes through the blocks mounted in the left hand portion of 515 internal webs of the blocks 1 aid in the dethe die'head. as viewed in Fig. 2, have on their Si! ed even tempering of the blocks, and in, right hand end projections 31 on which are preventing cracks and strains. These holes formed male dies. The right hand rows of also lighten the blocks, ventilate them, and die blocks have mounted on their left-hand perhaps tends to relieve any air drag of one ends corresponding female dies. Each die block on its neighbor. Such recessed and block is shown as provided with a notch 32 perforated blocks may be mounted snugly into which extends the lower end of a spring side by side in an open frame, each block 40. These sprin s are tines of acombmountb i adily perable independently of its ed on brackets 4-1 secured to the die head neighbors, as desired. Such die blocks conand serve to keep the die blocks normally stit-uting the subject matter of this applicawithdrawn in the position shown in Fig. 2.

tion, are illustrated in the drawings hereof That pair of die blocks which is brought and hereinafter more fully explained. into operative position by the shifting of In the drawings Fig. 1 is a side elevation the die head stands directly between a pair of a reeiprocatory die head carrying die of plungers 45 which may then be caused blocks made in accordance with my inven to approach each other to shove selected die tion; Fig. 2 is a cross section through such blocks inwardly, whereupon a projection 31 die head, as indicated by the line 22 of of the rear die block enters the channel of Fig. 1; Fig. 3 is across-section parallel with the ribbon A and the female face of the the plane of Fig. 1 through three adjacent o osed die block stands against the face of die blocks, the plane of the section being the ribbon, so that the character is embossed on such ribbon. It is to be understood that at this selected position, the frame bars 25 and 26 are cut away, as shown at 28, to enable the die blocks to emboss the ribbon.

Each of the die blocks is shown as having three related characters on its face, either one of three sets being rendered active by the shift mechanism not shown. Fig. 1 indicates at 38, one of the members of a'pair of shearing dies adapted to cut off the en1- bossed ribbon as explained in my application heretofore mentioned.

To enable the die blocks to rest snugly against each other side by side without causing the undue adhesion, which even though the die blocks are hardened and smoothed, might be very troublesome, I reduce the area of engagement by recessing the sides of each die block with a rectangular recess shown at 35, giving the die block substantially an I-shape in cross-section. These die blocks must be very hard, they musthave their engaging side surfaces very smooth. I find that they can be better'tempered to'give them these characteristics if holes are made through the web. Such holes also lighten the blocks without materially reducing their strength. They also serve to ventilate the members and may have the effect of relieving the suctional dragging effect of one block 011 its neighbor. At all events, I find that when the blocks are 'recessed on their sides and have two circular openings through the webs, as shown at 36 in the drawings, that a perfectly satisfactory operation is obtained.

By reason of'the die blocks being hardened and the border portions of their sides being very smooth they fit so closely together that the set occupies the entire space provided in the die head and there is practically no clearance between adjacent blocks. Notwithstanding this, my experience shows that such recessed and perforated blocks, mounted snugly side by side as shown in the "drawings, will operate freely and easily and independently of each other, and will accurately perform the embossing operation. I thus make a simpler and cheaper construc-,

said spaces respectively and equipped respectively with male dies and female dies on their opposed faces, said die blocks rubhing against each other and each recessed at its side.

The combination of a reciprocatory die head having a pair of opposed cavities,'two rows of die blocks freely mounted in said cavities respectively and equipped respectively with male dies and female dies on their opposed ends, against each other'attheir sides, the opposite sides of the central region of each block being recessed to make each block substantially Lshaped in crosssection.

t. The combination of" a reciprocatory die head having a pair of opposed open cavities, two rows of die blocks mounted in said cavities respectively and equipped one with male dies and the other with female dies on theira'djacentends, said die blocks being freely mounted in said cavities without guiding ribs and rubbing against each other with their sides, said sides being recessed to make each block substantially Ishaped in cross-section and one or more holes through the internal webs of the blocks.

In testimony whereof, I hereunto afiix'iny signature.

CLIFTON CHlSI-IOLM;

said die blocks rubbing 

